JP6656149B2 - Synchronous rotor for rotating electrical machines - Google Patents

Synchronous rotor for rotating electrical machines Download PDF

Info

Publication number
JP6656149B2
JP6656149B2 JP2016528775A JP2016528775A JP6656149B2 JP 6656149 B2 JP6656149 B2 JP 6656149B2 JP 2016528775 A JP2016528775 A JP 2016528775A JP 2016528775 A JP2016528775 A JP 2016528775A JP 6656149 B2 JP6656149 B2 JP 6656149B2
Authority
JP
Japan
Prior art keywords
rotor
core
core plate
peripheral
arc
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
JP2016528775A
Other languages
Japanese (ja)
Other versions
JPWO2015198382A1 (en
Inventor
真臣 森下
真臣 森下
Original Assignee
日産自動車株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日産自動車株式会社 filed Critical 日産自動車株式会社
Priority to PCT/JP2014/066585 priority Critical patent/WO2015198382A1/en
Publication of JPWO2015198382A1 publication Critical patent/JPWO2015198382A1/en
Application granted granted Critical
Publication of JP6656149B2 publication Critical patent/JP6656149B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K1/00Details of the magnetic circuit
    • H02K1/06Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22Rotating parts of the magnetic circuit
    • H02K1/27Rotor cores with permanent magnets
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K1/00Details of the magnetic circuit
    • H02K1/06Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22Rotating parts of the magnetic circuit
    • H02K1/28Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/64Electric machine technologies in electromobility

Description

  The present invention relates to a synchronous rotor for a rotating electric machine including a cylindrical rotor core formed by stacking a plurality of arc-shaped core plates, and a permanent magnet embedded in the rotor core.

  As a synchronous rotor of a rotating electrical machine, a rotor core formed by laminating a plurality of divided core plates while arranging them in an annular shape, and a magnet (permanent) inserted into a magnet hole (magnet hole) formed in the divided core plate are used. Magnet). Conventionally, as the synchronous rotor, two through holes are formed on the inner peripheral side of the divided core plate, and when the divided core plates are arranged in an annular shape, the through holes are arranged at equal intervals. Further, the rotor core is laminated so that the through holes communicate with each other along the axial direction of the rotor core, and a fixing pin is inserted into the communicating through hole. That is, there is known one in which divided core plates stacked in the axial direction are connected to each other by a fixing pin (for example, see Patent Document 1).

JP 2008-092650 A

  However, in the conventional synchronous rotor for rotary electric machines, the end region from the fixing pin to the end surface of the split core plate in the split core plate has a cantilever structure that is not restrained and supported. For this reason, in the end region having the cantilever structure, the deformation in the outer diameter direction becomes larger due to the centrifugal force generated when the rotor rotates, as compared with the region not having the cantilever structure. Then, in the end region having the cantilever structure, due to the deformation due to the centrifugal force, the stress of the bridge portion having a relatively small thickness between the outer peripheral end of the divided core plate and the outer diameter side of the magnet hole increases. , The bridge portion may be damaged. For this reason, there has been a problem that the centrifugal strength reliability of the rotor core is reduced.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a synchronous rotor for a rotating electric machine that can improve the reliability of a rotor core against centrifugal strength.

To achieve the above object, a synchronous rotor for a rotating electrical machine of the present invention includes a cylindrical rotor core formed by stacking a plurality of arc-shaped core plates, and a permanent magnet embedded in the rotor core. I have. In the synchronous rotor for a rotating electrical machine, a connecting portion for connecting the plurality of arc-shaped core plates stacked in the rotor axial direction is provided on an inner peripheral side of the rotor core. The surface connecting the connecting portions in the circumferential direction is defined as the inner peripheral surface of the core plate. The arc-shaped core plate has magnet holes drilled on the plate outer peripheral side, and both ends of the inner peripheral surface of the core plate avoiding the portion serving as the coupling portion in the outer radial direction from the inner peripheral surface of the core plate. And a bridge portion having a relatively small thickness between the outer peripheral end of the core plate and the outer diameter side of the magnet hole. The bridge portion has a region from the coupling portion to the coupling portion of the core plate and a region from the coupling portion to an end portion. Then, the core plates adjacent from the coupling portion to a region of the cantilever structure to the end which is not coupled, the cut portion has only a region to be a pre-Symbol cantilever structure.

Therefore, the arc-shaped core plate in the synchronous rotor for a rotating electrical machine has a cantilever structure in a region from the coupling portion to the end of the core plate, and has a cutout in that region.
In other words, the centrifugal force generated at both ends of the core plate is reduced by providing the notches at both ends of the inner peripheral surface of the core plate in that region when the rotor rotates. Due to the reduction of the centrifugal force, deformation of both ends of the core plate due to the centrifugal force in the outer diameter direction is suppressed to be small, and an increase in stress of the bridge portion can be suppressed.
As a result, the reliability of the centrifugal strength of the rotor core during rotation of the rotor can be improved.

FIG. 2 is an exploded perspective view of the synchronous rotor for the rotating electric machine according to the first embodiment. FIG. 3 is a schematic plan view of an arc-shaped core plate forming the rotor core of the first embodiment. FIG. 2 is an assembly configuration diagram in which a plurality of arc-shaped core plates of the first embodiment are arranged in an annular shape. FIG. 3 is a configuration diagram of assembling a rotor core by stacking a plurality of arc-shaped core plates according to the first embodiment. FIG. 4 is a rotor welding joint process diagram in which a continuous welded portion of the first embodiment is formed. FIG. 4 is a process diagram of inserting a permanent magnet into a magnet hole according to the first embodiment. FIG. 9 is a schematic plan view of an arc-shaped core plate forming a rotor core of the second embodiment. FIG. 14 is a schematic enlarged plan view of a notch showing a modified example of the curved shape of the notch according to the second embodiment. FIG. 13 is a schematic enlarged plan view of a notch showing a modification of the straight shape of the notch according to the second embodiment. FIG. 13 is a schematic plan view of an arc-shaped core plate forming a rotor core according to a third embodiment.

  Hereinafter, the best mode for realizing a synchronous rotor for a rotating electrical machine according to the present invention will be described based on Embodiments 1 to 3 shown in the drawings.

First, the configuration will be described.
FIG. 1 is an exploded perspective view of a synchronous rotor for a rotating electric machine according to a first embodiment, and the entire configuration will be described below with reference to FIG. Note that details of the second and lower layers from the top are partially omitted.

  The synchronous rotor 1 for a rotating electric machine according to the first embodiment constitutes a motor together with a stator, and is applied, for example, as a driving source for an electric vehicle or a hybrid vehicle.

  The synchronous rotor 1 for a rotating electrical machine has a cylindrical rotor core 2, a permanent magnet 3 embedded in the rotor core 2, and a rotor shaft 4 fitted to the rotor core 2.

  The rotor core 2 is formed in a cylindrical shape having a space inside by arranging a plurality of arc-shaped core plates 2a (see FIG. 2) in an annular shape and stacking the annularly arranged core plates 2a. I have.

  The arc-shaped core plate 2a is made of an electromagnetic steel sheet, has an arc angle θ1 of 120 °, and has a magnet hole 3a, a welded portion 5, and a cutout portion 6, as shown in FIG. are doing. As shown in FIG. 2, the core plate 2a has four magnet holes 3a and four welds 5 at equal intervals. The core plate 2a has cutouts 6 at both ends 2PE, 2PE, as shown in FIG.

  As shown in FIG. 2, the magnet hole 3a is a hole for inserting the permanent magnet 3 opened on the outer peripheral side of the plate. The shape of the magnet hole 3a is formed in a rectangular shape extending in the circumferential direction.

  As shown in FIG. 2, the welding portion 5 is formed at the inner peripheral end of the plate. The welded portion 5 has a concave surface 5a and a convex portion 5b, as shown in the lower right enlarged view of FIG. The concave surface 5a is formed so as to be concave in the outer radial direction from the inner peripheral surface 2IP of the core plate 2a. The shape of the concave surface 5a is formed as a curved surface as shown by a solid line and a broken line. The convex portion 5b is formed on a part of the concave surface 5a so as to protrude in a range from the concave surface 5a to the inner peripheral surface 2IP of the core plate 2a. The shape of the protrusion 5b is formed in a triangular shape.

As shown in FIG. 2, the notch 6 is located at a position avoiding a portion to be a welded joint 11 (joint portion, weld bead, see FIG. 5), that is, a position other than the welded portion 5. Both ends 2PE, 2PE of the peripheral surface 2IP are notched and formed.
As shown in FIG. 2, the notch 6 has a shape in which a region A from the offset position 2FS to the end face 2EF of the core plate 2a has a predetermined depth PD cut from the inner peripheral surface 2IP of the core plate in the outer diameter direction. (The shape of the notch 6). The predetermined depth PD in the first embodiment is constant in the area A in the outer diameter direction from the inner peripheral surface 2IP of the core plate 2a.
Here, the offset position 2FS is a position offset from the welded portion 5 by an offset amount FS toward the circumferential end face of the core plate 2a. The target welded portion 5 is a welded portion 5 arranged on the end 2PE side of the core plate 2a as shown in FIG. Further, the offset amount FS offset from the welded portion 5 to the circumferential end face side of the core plate 2a is an amount that can be formed by a later-described welded joint portion 11 (joint portion, weld bead, see FIG. 5), that is, welding. This is an amount for securing the part 5. As shown in FIG. 2, the specific offset amount FS is from the center position in the circumferential direction of the welded portion 5 (a radial axis CL described later) to an offset position 2FS.
Further, the predetermined depth PD is a depth that does not reach the magnet hole 3a arranged on the end 2PE side of the core plate 2a from the inner peripheral surface 2IP of the core plate 2a, and is inserted into the magnet hole 3a. The depth is set in consideration of the formation of lines of magnetic force by the permanent magnet 3. That is, the notch 6 is formed while the formation of the magnetic field lines by the permanent magnet 3 is maintained.

As shown in FIG. 2, the welding portion 5 is arranged on the same axis as a radial axis CL that radially connects the center point O of the core plate 2a and the circumferential center position of the magnet hole 3a. That is, the center positions of the magnet hole 3a and the welded portion 5 in the circumferential direction are arranged on the same axis of the radial axis CL. Similarly, the center positions of the concave surface 5a and the convex portion 5b in the circumferential direction are also arranged on the same axis of the radial axis CL.
Here, the center point O of the core plate 2a is the same as the center point O when a plurality of arc-shaped core plates 2a are annularly arranged (see FIG. 3). That is, the rotor core 2 is formed by stacking the annularly arranged core plates 2 a, so that the center point O of the core plate 2 a is also the same as the center point of the rotor core 2. The inner peripheral surface 2IP of the core plate 2a and the inner peripheral surface 2IP of the rotor core 2 also have the same center point for the same reason.

  The cylindrical rotor core 2 is formed by laminating a plurality of such arc-shaped core plates 2a. On the inner peripheral surface 2IP of the formed rotor core 2, a linear continuous welded portion 10 continuous with the welded portion 5 between the plurality of core plates 2a stacked in the direction of the rotor axis Ax is formed (see FIG. 5).

As shown in FIGS. 1 and 6, a weld bead 11 (weld joint, joint) is formed by welding the continuous weld 10. Thereby, the laminated core plates 2a are joined together. This welding may be performed by melting the base 5, that is, the convex portion 5 b of the welded portion 5 in the continuous welded portion 10, or may be performed by melting the convex portion 5 b and the welding wire. The amount of fusion of the welding wire is such that it falls within the concave surface 5a of the welded portion 5, that is, the range from the concave surface 5a to the inner peripheral surface 2IP of the core plate 2a.
In addition, since the notch part 6 is formed avoiding the welding part 5 used as the welding bead 11, the uniformity of the shape of the welding bead 11 can be ensured.

  The rotor shaft 4 is formed in a cylindrical shape having a space inside. A rotating shaft (not shown) and the like are inserted into this inner space. The rotor shaft 4 is press-fitted into the rotor core 2 so that the rotor shaft 4 is fitted to the rotor core 2.

Next, the operation will be described.
The operation of the synchronous rotor for a rotating electric machine 1 according to the first embodiment will be described by dividing it into a “method of manufacturing a synchronous rotor for a rotating electric machine”, a “characteristic operation of a synchronous rotor for a rotating electric machine”, and an “operation of a cutout shape”.

[Method of manufacturing synchronous rotor for rotating electric machine]
The manufacturing operation of the synchronous rotor for a rotating electric machine according to the present invention will be described with reference to FIGS. Method for manufacturing synchronous rotor 1 for rotary electric machine provided with synchronous rotor 1 having cylindrical rotor core 2 formed by laminating a plurality of arc-shaped core plates 2a, and permanent magnet 3 embedded in rotor core 2 Has a core plate forming step, a rotor core assembling step, a rotor welding joining step, and a permanent magnet inserting step. Hereinafter, each step will be described. Note that details of the second and lower layers from the top in FIGS. 5 and 6 are partially omitted.

(Core plate molding process)
In the core plate forming step, as shown in FIG. 2, a magnet hole 3a for inserting a permanent magnet 3 opened on the outer periphery of the plate is formed in an arc-shaped core plate 2a, and a magnet hole 3a is formed on an inner peripheral end of the plate. A welded portion 5 and a cutout 6 formed by cutting out both ends 2PE of the inner peripheral surface 2IP of the core plate 2a are formed.

(Rotor core assembly process)
In the rotor core assembling step, as shown in FIG. 3, a plurality of arc-shaped core plates 2a are annularly arranged. That is, as shown in FIG. 2, about three core plates 2a each having an arc angle θ1 of 120 ° are arranged in an annular shape. In FIG. 4, the core plate 2a arranged in a ring shape is a first layer. The cylindrical rotor core 2 is assembled by stacking the annularly arranged core plates 2a. That is, as shown in FIG. 4, on the first layer core plate 2a, the angle θ2 (= 30 °) is shifted in the rotation direction (for example, counterclockwise) of the rotor core 2 with respect to the first layer core plate 2a. The two-layer core plate 2b is laminated. Subsequently, as shown in FIG. 4, a third-layer core plate 2c is stacked on the second-layer core plate 2b while being shifted counterclockwise by 30 ° with respect to the second-layer core plate 2b. In this way, the next layer is laminated by being shifted counterclockwise by 30 ° with respect to the previous layer, that is, straddling the seam between the core plates 2a of the previous layer. Is assembled. In order to assemble the cylindrical rotor core 2, for example, about 54 core plates 2a are used and about 18 layers are laminated.

(Rotor welding joining process)
In the rotor welding step, the positioning is performed such that the magnet holes 3a between the plurality of core plates 2a stacked on the rotor core 2 in the direction of the rotor axis Ax communicate with each other in the direction of the rotor axis Ax. That is, the positioning is performed so that the permanent magnet 3 can be inserted into the communicating magnet hole 3a (see FIG. 5). This alignment is performed using a jig. As shown in FIG. 5, a linear continuous welded portion 10 continuous with the welded portion 5 between the plurality of core plates 2a stacked in the direction of the rotor axis Ax is formed on the inner peripheral surface 2IP of the rotor core 2 where the alignment is performed. Is formed. Next, the continuous welded portion 10 is arranged on the same axis as the radial axis CL that radially connects the circumferential center position of the magnet hole 3a and the center point O of the rotor core 2 (center point of the core plate 2a). In this state, the continuous welded portion 10 is joined by welding. Thereby, as shown in FIG. 6, a weld bead 11 is formed.

(Permanent magnet insertion process)
In the permanent magnet insertion step, after positioning is performed and welding is performed, the permanent magnet 3 is inserted into the communicating magnet hole 3a as shown in FIG. The rotor shaft 4 is press-fitted into the rotor core 2 manufactured as described above, whereby the rotor shaft 4 is fitted to the rotor core 2.

  Through the above steps, in addition to inserting the permanent magnet 3 into the magnet hole 3a and welding the welded portion 5 between the plurality of core plates 2a, the synchronous rotor 1 for a rotating electric machine can be manufactured. .

As described above, by manufacturing the synchronous rotor for the rotating electric machine, in the first embodiment, the projections 5b can be intensively welded, and thus the penetration of the welding bead 11 is minimized while the heat input during welding is minimized. The width and the depth can be adjusted constant (stable) and easily, and the joining strength of the rotor core 2 can be increased. In addition, since the synchronous rotor 1 assembly alone can secure centrifugal strength between the core plates 2a by welding, damage due to a load input to the permanent magnet 3 is prevented. As a result, by ensuring the centrifugal strength of the rotor core 2, the durability reliability of the permanent magnet 3 can be improved.
In addition, since the weld bead 11 fits within the concave surface 5 a of the welded portion 5, there is no need to process the rotor shaft 4 in accordance with the rotor core 2. That is, the surface of the rotor shaft 4 may have a simple cylindrical shape as shown in FIG.

[Characteristic operation of synchronous rotor for rotating electric machine]
For example, a magnet hole for inserting a permanent magnet and two through holes for inserting a fixing pin are formed in the divided core plate. The through holes are formed on the inner peripheral side of the divided core plate, and when the divided core plates are arranged in an annular shape, the through holes are arranged at equal intervals. Then, a rotor core is formed by laminating the plurality of divided core plates thus formed while being arranged in an annular shape, a permanent magnet is inserted into the magnet hole, and a fixing pin is inserted into the through hole. A comparative example is a synchronous rotor in which the rotor shaft is fitted to the rotor core, that is, the divided core plates laminated in the axial direction by the fixing pins are connected. According to the synchronous rotor of this comparative example, the end region from the fixing pin to the end surface of the split core plate in the split core plate has a cantilever structure that is not restrained and supported.

  However, in the end region having the cantilever structure, the deformation in the outer diameter direction becomes larger due to the centrifugal force generated when the rotor rotates, as compared with the region not having the cantilever structure. Then, in the end region having the cantilever structure, due to the deformation due to the centrifugal force, the stress of the bridge portion having a relatively small thickness between the outer peripheral end of the divided core plate and the outer diameter side of the magnet hole increases. , The bridge portion may be damaged (for example, permanent deformation). For this reason, there has been a problem that the reliability of the centrifugal strength of the rotor core is reduced.

  Further, when assembling the rotor core by laminating the divided core plates, positional deviation occurs in the plane of the end faces of the divided core plates due to assembly variations. At this time, the inner peripheral end of the split core plate protrudes from the inner peripheral surface of the rotor core due to the positional deviation. For this reason, there has been a problem that the protrusion increases the inner diameter variation.

  Thus, there is a problem that the reliability of the centrifugal strength of the rotor core is reduced. In addition, there is a problem that the protrusion increases the inner diameter variation.

On the other hand, in the first embodiment, the arc-shaped core plate 2a of the synchronous rotor 1 for the rotating electric machine is formed in the region B (the hatched portion in FIG. 2) from the weld joint 11 (joint portion) to the end 2PE of the core plate 2a. ) Has a cantilever structure, and has a configuration in which a notch 6 is provided in a region B having the cantilever structure.
That is, the mass of the region B having the cantilever structure is reduced. For this reason, the centrifugal force generated at both ends 2PE, 2PE of the core plate 2a is reduced by providing the notches 6 at both ends 2PE, 2PE of the inner peripheral surface 2IP of the core plate 2a in the region B when the rotor rotates. Is done. Due to the reduction of the centrifugal force, the deformation of the ends 2PE, 2PE of the core plate 2a due to the centrifugal force in the radial direction in the outer diameter direction is suppressed to be small, and the increase in the stress of the bridge C (FIG. 2) can be suppressed.
Therefore, during rotation of the rotor, the reliability of the centrifugal strength of the rotor core 2 can be improved.

  In addition, since both ends 2PE of the inner peripheral surface 2IP of the core plate 2a are cut off, the end 2PE of the inner peripheral surface 2IP of the core plate 2a is removed from the inner peripheral surface 2IP of the rotor core 2 at the time of manufacturing the rotor core 2. Since the amount of protrusion to the (inner peripheral side end) is reduced, an increase in variation in the inner diameter can be suppressed. Therefore, the dimensional quality of the rotor core 2 can be improved.

[Function of Notch Shape]
In the first embodiment, in the area A from the offset position 2FS to the end face 2EF of the core plate 2a in the area B where the notch 6 has the cantilever structure, the notch 6 is predetermined in the radial direction from the inner peripheral surface 2IP of the core plate 2a. The configuration in which the notch PD has a notch shape (shape of the notch 6) is adopted.
That is, the mass of the region B having the cantilever structure is reduced. For this reason, the centrifugal force generated when the rotor rotates is reduced as compared with the case where the shape of the notch 6 is not set.
Therefore, at the time of rotation of the rotor, the deformation due to the centrifugal force in the outer radial direction of both ends 2PE of the core plate 2a can be suppressed.

Next, effects will be described.
In the synchronous rotor 1 for a rotating electrical machine according to the first embodiment, the following effects can be obtained.

(1) In a synchronous rotor 1 for a rotating electrical machine including a cylindrical rotor core 2 formed by stacking a plurality of arc-shaped core plates 2a and a permanent magnet 3 embedded in the rotor core 2.
Provided on the inner peripheral side of the rotor core 2 is a joint (welded joint 11) for joining a plurality of arc-shaped core plates 2a stacked in the direction of the rotor axis Ax,
The arc-shaped core plate 2a cuts both ends 2PE, 2PE of the inner peripheral surface 2IP of the core plate 2a avoiding a portion to be a joint (weld joint 11), and a magnet hole 3a opened on the outer peripheral side of the plate. And a notched portion 6 which is missing.
Therefore, the reliability of the centrifugal strength of the rotor core 2 during rotation of the rotor can be improved.

(2) The arc-shaped core plate 2a has a welded portion 5 formed on the inner peripheral end of the plate.
The joint (weld joint 11) is a weld joint formed by welding a linear continuous weld 10 continuously formed by the welds 5 between the plurality of core plates 2a stacked in the rotor axial direction. Part 11;
The notch 6 defines a region A from an offset position 2FS offset from the weld 5 to the circumferential end face side of the core plate 2a to an end face 2EF of the core plate 2a in a radial direction from the inner circumferential face 2IP of the core plate 2a. The depth PD was set to a notched shape.
For this reason, in addition to the effect of (1), deformation due to centrifugal force in the outer diameter direction of both ends 2PE of the core plate 2a during rotation of the rotor can be suppressed.

  The second embodiment is a modification of the notch 6. The configuration of the main part of the second embodiment will be described below with reference to FIG.

As shown in FIG. 7, the notch 6 has a shape (a shape of the notch 6) in which the notch depth in the outer diameter direction gradually increases from the offset position 2FS toward the end face 2EF of the core plate 2a. Is set.
The shape of the notch 6 is formed in a curved shape as shown in FIG. It should be noted that the present invention is not limited to the curved shape shown in FIG. 7, but may be a curved shape different from that shown in FIG. 7 as shown in FIG. 8, or a linear shape shown in FIG. In short, the shape may be set so that the notch depth in the outer diameter direction gradually increases from the offset position 2FS toward the end face 2EF of the core plate 2a.
Other configurations are the same as those of the first embodiment, and the corresponding components are denoted by the same reference numerals and description thereof is omitted.

  Next, the “action of the shape of the notch” in the synchronous rotor 1 for a rotating electric machine according to the second embodiment will be described with reference to FIG. 7.

  Generally, in a region having a cantilever structure, when the rotor rotates, the deformation due to the centrifugal force in the outer radial direction increases toward the end face of the core plate.

On the other hand, in the second embodiment, as shown in FIG. 7, as the notch 6 moves from the offset position 2FS to the end face 2EF of the core plate 2a, the notch depth in the outer diameter direction gradually increases. A configuration was adopted for the shape (shape of the notch 6).
That is, in the region B having the cantilever structure, the reduction of the mass of the core plate 2a increases toward the end face 2EF of the core plate 2a.
Accordingly, the centrifugal force is more effectively reduced from the offset position 2FS toward the end face 2EF of the core plate 2a during the rotation of the rotor than when the shape of the notch 6 is not set as described above.
Therefore, when the rotor rotates, the deformation due to the centrifugal force in the outer diameter direction can be effectively suppressed toward the end face 2EF of the core plate 2a.
In addition, only the function of the shape of the notch 6 of the first embodiment and the second embodiment is different, and other functions are the same as those of the first embodiment.

Next, effects will be described.
In the synchronous rotor 1 for a rotating electric machine according to the second embodiment, the following effect can be obtained in addition to the effect (2) of the first embodiment.

(3) The notch 6 is formed in such a shape that the notch depth in the outer diameter direction gradually increases from the offset position 2FS toward the end face 2EF of the core plate 2a.
Therefore, when the rotor rotates, the deformation due to the centrifugal force in the outer diameter direction can be effectively suppressed toward the end face 2EF of the core plate 2a.

  Example 3 is a modification of the core plate 2a, the welded portion 5, and the cutout portion 6. The configuration of the main part of the third embodiment will be described below with reference to FIG.

  As shown in FIG. 10, the arc-shaped core plate 2a is formed of an outer-circumference-side arc 21a as its outer periphery and an offset arc 22 as its inner periphery.

  As shown in FIG. 10, the outer peripheral side arc 21a is an arc centered on the center point O1 (reference center point) of the core plate 2a. Note that the center point O1 is the same as the center point O in the first embodiment.

The offset arc 22 will be described below with reference to FIG.
First, a core plate formed of an outer peripheral side arc 21a and an inner peripheral side arc 21b (dashed line in FIG. 10) of a concentric circle centered on the center point O1 is defined as a reference core plate 21. As shown in FIG. 10, the radius of the outer peripheral side arc 21a is defined as a reference outer peripheral side radius R1, and the radius of the inner peripheral side arc 21b is defined as a reference inner peripheral side radius R2.
Next, a straight line L1 (dash-dot line) connecting the circumferential center point 21b1 (circumferential center) of the inner circumferential side arc 21b and the center point O1 is drawn on the extension line EL extending beyond the center point O1. The center point offset from is set as the offset center point O2.
Subsequently, a straight line L2 (dot-dash line) connecting the offset center point O2 and the circumferential center point 21b1 of the inner circumferential arc 21b is defined as an offset radius R3 (radius), and the reference core is defined from the circumferential center point 21b1 of the inner circumferential arc 21b. An arc extending in the circumferential direction up to both end surfaces 21EF of the plate 21 is referred to as an offset arc 22.
Here, the radius of curvature of the offset circular arc 22 is larger than the radius of curvature of the inner circular arc 21b, and the offset circular arc 22 is larger than the inner circular arc 21b from the center point 21b1 in the circumferential direction of the inner circular arc 21b to the end face of the core plate 2a. As it approaches 2EF, it approaches the outer peripheral side arc 21a.

The welded portion 5 will be described below with reference to FIGS.
Also in the third embodiment, as described in the rotor core assembling process of the first embodiment, as shown in FIG. 4, the angle of the rotor core 2 in the rotation direction with respect to the first layer core plate 2a is higher than the first layer core plate 2a. The second-layer core plate 2b is stacked while being shifted by θ2.
At this time, if four identically shaped welds 5 are formed on the core plate 2a of the third embodiment in the same manner as in the first embodiment, the core plate 2a of the third embodiment is formed by the outer peripheral side arc 21a and the offset arc 22. Since the center points O1 and O2 are different, the welded portion 5 between the first layer core plate 2a and the second layer core plate 2b does not coincide in the direction of the rotor axis Ax.
Therefore, in the welded portion 5 of the third embodiment, the arrangement and shape of the welded portion 5CE on the center in the circumferential direction of the core plate 2a and the welded portion 5EF on the end face in the circumferential direction are different.
That is, when the second layer core plate 2b is laminated with the angle θ2 shifted in the rotation direction of the rotor core 2 with respect to the first layer core plate 2a, the welded portion between the first layer core plate 2a and the second layer core plate 2b is formed. The protrusions 5b of the core plate 2a are respectively formed at positions where the protrusions 5b of the core plate 2a coincide with each other in the direction of the rotor axis Ax.
In other words, as shown in FIG. 10, the circumferential direction of the core plate 2 a is formed such that a continuous linear continuous welded portion 10 is formed by the welded portion 5 between the plurality of core plates 2 a stacked in the direction of the rotor axis Ax. The convex portions 5b on the center side and the circumferential end face side are arranged at different positions.
The shape of the convex portion 5b is formed in a triangular shape as in the first embodiment (see FIG. 2 of the first embodiment).

  The concave surface 5a of the welded portion 5 is formed so as to match the convex portion 5b on the circumferential end surface side and the circumferential center side of the core plate 2a. That is, as shown in FIG. 10, the concave surface 5a is formed such that the center side in the circumferential direction is deeper in the outer diameter direction from the inner circumferential surface 2IP of the core plate 2a than the end surface side in the circumferential direction of the core plate 2a. I have. The shape of these concave surfaces 5a is formed into a curved surface shape having different depths (see FIG. 2 of the first embodiment).

As shown in FIG. 10, the notch 6 is formed so as to be cut out from the reference core plate 21 in the outer diameter direction from the inner peripheral side arc 21 b to the offset arc 22 (the shape of the notch 6). The shape of the notch 6 is set such that the depth of the notch in the outer diameter direction gradually increases from the offset position 2FS toward the end face 2EF of the core plate 2a.
Here, the center between the circumferential center point 21a1 (circumferential center) of the outer circumferential arc 21a and the circumferential center point 22a (circumferential center) of the offset arc 22 (= the circumferential center point 21b1 of the inner circumferential arc 21b). The end face yoke width W2 of the outer peripheral side arc 21a and the offset arc 22 on the end face 2EF of the core plate 2a is smaller than the yoke width W1.
Other configurations are the same as those of the first embodiment, and the corresponding components are denoted by the same reference numerals and description thereof is omitted.

  Next, the “action of the shape of the notch” in the synchronous rotor 1 for a rotating electrical machine according to the third embodiment will be described with reference to FIG.

  Generally, in a region having a cantilever structure, when the rotor rotates, the deformation due to the centrifugal force in the outer radial direction increases toward the end face of the core plate.

On the other hand, in the third embodiment, as shown in FIG. 10, the notch 6 has a shape in which the notch 6 is cut out from the reference core plate 21 in the outer diameter direction from the inner circumferential arc 21 b to the offset arc 22 (the notch 6 (Shape).
That is, in the region B having the cantilever structure, the mass reduction of the core plate increases from the offset position 2FS to the end surface 2EF of the core plate 2a.
Accordingly, the centrifugal force is more effectively reduced from the offset position 2FS toward the end face 2EF of the core plate 2a during the rotation of the rotor than when the shape of the notch 6 is not set as described above.
Therefore, when the rotor rotates, the deformation due to the centrifugal force in the outer diameter direction can be effectively suppressed toward the end face 2EF of the core plate 2a.
In addition, only the shape of the cutout portion 6 of the first embodiment and the third embodiment is different from that of the first embodiment, and the other operations are the same as those of the first embodiment.

Next, effects will be described.
In the synchronous rotor 1 for a rotating electrical machine according to the third embodiment, the following effect can be obtained in addition to the effect (1) of the first embodiment.

(4) A core plate formed of a concentric outer peripheral arc 21a and an inner peripheral arc 21b around a reference center point (center point O1) is referred to as a reference core plate 21,
A straight line L connecting the circumferential center (circumferential center point 21b1) of the inner circumferential arc 21b and the reference center point (center point O1) is drawn on an extension line EL extending beyond the reference center point (center point O1). A center point offset from the reference center point (center point O1) is defined as an offset center point O2,
A straight line connecting the offset center point O2 and the circumferential center (circumferential center point 21b1) of the inner circumferential arc 21b is defined as a radius (offset radius R3) from the circumferential center (circumferential center point 21b1) of the inner circumferential arc 21b. When an arc extending in the circumferential direction up to both end surfaces 21EF of the reference core plate 21 is defined as an offset arc 22,
The cutout portion 6 was set to have a shape cut out from the reference core plate 21 in the outer diameter direction from the inner circumferential side arc 21 b to the offset arc 22.
Therefore, when the rotor rotates, the deformation due to the centrifugal force in the outer diameter direction can be effectively suppressed toward the end face 2EF of the core plate 2a.

  As described above, the synchronous rotor for a rotating electric machine according to the present invention has been described based on the first to third embodiments. However, the specific configuration is not limited to these embodiments, and the claims are not limited thereto. Changes or additions to the design are permitted without departing from the gist of the present invention.

  In the first to third embodiments, an example is shown in which four magnet holes 3a and four welds 5 are formed at equal intervals in the configuration of one core plate 2a. However, the configuration of one core plate 2a is not limited to the configurations shown in the first to third embodiments. For example, since each of the magnet hole 3a and the welded portion 5 only needs to be formed at equal intervals, each may be formed with less or more than four.

  Embodiments 1 to 3 show an example in which the number of core plates 2a constituting each layer is three. However, the number of core plates 2a constituting each layer is not limited to the configurations shown in the first to third embodiments. For example, the number of core plates 2a constituting each layer may be smaller or larger than three. However, when the number of core plates 2a constituting each layer is changed, the angles θ1 and θ2 of the arc are changed in accordance with the number of core plates 2a constituting each layer.

  In the first to third embodiments, an example has been described in which the angle θ2 is set to 30 ° and is shifted counterclockwise. However, the angle θ2 is not limited to the configuration shown in the first to third embodiments. That is, the next layer may be laminated so as to straddle the seam between the core plates 2a of the previous layer, so that the angle may not be 30 °. In addition, although it is shifted clockwise, it may be shifted clockwise.

  In the first to third embodiments, an example has been described in which the shape of the magnet hole 3a is formed in a rectangular shape extending in the circumferential direction, and the number thereof is one on the same radial axis CL. However, the shape and number of the magnet holes 3a are not limited to the configurations shown in the first to third embodiments. For example, the shape may be an elliptical shape, a rhombus shape, a trapezoidal shape, or the like, and the number thereof may be such that two or more holes are opened for one radial axis CL.

  Embodiments 1 to 3 show an example in which the concave surface 5a of the welded portion 5 is formed into a curved surface, and the shape of the convex portion 5b is formed into a triangular shape. However, the shapes of the concave surface 5a and the convex portion 5b of the welded portion 5 are not limited to the configurations shown in the first to third embodiments. For example, the concave surface 5a may be a flat surface or a shape combining a curved surface and a flat surface. The convex portion 5b may have a circular shape, an elliptical shape, a rectangular shape, a diamond shape, a trapezoidal shape, or the like.

  In the first to third embodiments, an example has been described in which the region B from the welded joint portion 11 (joined portion) to the end 2PE of the core plate 2a has a cantilever structure by welding. However, the configuration is not limited to the configurations shown in the first to third embodiments. For example, the connecting portion may be formed by employing a caulking structure, and the region B from the connecting portion to the end 2PE of the core plate 2a may have a cantilever structure. In short, if the region B from the joint to the end 2PE of the core plate 2a has a cantilever structure, the joint is not limited to welding or swaging.

  In the first to third embodiments, the example in which the rotor shaft 4 is fitted into the rotor core 2 by press-fitting the rotor shaft 4 into the rotor core 2 has been described. However, the configuration is not limited to the configurations shown in the first to third embodiments. For example, besides press-fitting, general key engagement may be used. That is, one or several key grooves may be formed on the inner peripheral surface 2IP of the rotor core 2 and the outer peripheral surface of the rotor shaft 4, and a key may be inserted into these key grooves to prevent rotation. In the case where the rotor core 2 is formed by a plurality of core plates 2a, it is preferable to stop the rotation by key engagement rather than press-fitting.

Claims (3)

  1. In a synchronous rotor for a rotating electric machine, comprising: a cylindrical rotor core formed by stacking a plurality of arc-shaped core plates; and a permanent magnet embedded in the rotor core.
    On the inner peripheral side of the rotor core, a coupling portion that couples the plurality of arc-shaped core plates laminated in the rotor axis direction is provided,
    A surface connecting the coupling portions in the circumferential direction is defined as an inner peripheral surface of the core plate,
    The arc-shaped core plate has magnet holes drilled on the plate outer peripheral side, and both ends of the inner peripheral surface of the core plate avoiding the portion serving as the coupling portion in the outer radial direction from the inner peripheral surface of the core plate. A notch portion, and a bridge portion having a relatively thin thickness between the outer peripheral end of the core plate and the outer diameter side of the magnet hole,
    The bridge portion has a region from the coupling portion to the coupling portion of the core plate, and a region from the coupling portion to an end portion,
    A region from the coupling portion to the end portion not coupled to the adjacent core plate has a cantilever structure,
    The cutout, for rotary electric machines synchronous rotor and having the only area where the previous SL cantilever structure.
  2. The synchronous rotor for a rotating electric machine according to claim 1,
    The arc-shaped core plate has a welded portion formed at an inner peripheral end of the plate,
    The connecting portion is a welded joint formed by welding and joining a linear continuous welded portion formed continuously by the welded portion between the plurality of core plates stacked in the rotor axial direction,
    The notch cuts a region from an offset position offset from the welded portion to a circumferential end surface side of the core plate to an end surface of the core plate to a predetermined depth in an outer radial direction from an inner circumferential surface of the core plate. A synchronous rotor for a rotating electrical machine, characterized in that it has a missing shape.
  3. The synchronous rotor for a rotating electric machine according to claim 2,
    The synchronous rotor for a rotating electric machine, wherein the notch portion has a shape in which a notch depth in an outer diameter direction gradually increases from the offset position toward the end face of the core plate.
JP2016528775A 2014-06-23 2014-06-23 Synchronous rotor for rotating electrical machines Active JP6656149B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2014/066585 WO2015198382A1 (en) 2014-06-23 2014-06-23 Rotating electric machine synchronous rotor

Publications (2)

Publication Number Publication Date
JPWO2015198382A1 JPWO2015198382A1 (en) 2017-04-20
JP6656149B2 true JP6656149B2 (en) 2020-03-04

Family

ID=54937520

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2016528775A Active JP6656149B2 (en) 2014-06-23 2014-06-23 Synchronous rotor for rotating electrical machines

Country Status (2)

Country Link
JP (1) JP6656149B2 (en)
WO (1) WO2015198382A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016208692A1 (en) * 2016-05-20 2017-11-23 Zf Friedrichshafen Ag Rotor of an electric machine with a laminated core
EP3723241A1 (en) * 2017-12-08 2020-10-14 Nissan Motor Co., Ltd. Rotor core for rotating electric machine and method for manufacturing rotor core for rotating electric machine

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4881118B2 (en) * 2006-09-29 2012-02-22 本田技研工業株式会社 Method for manufacturing rotor core
JP4945377B2 (en) * 2007-08-31 2012-06-06 本田技研工業株式会社 Rotating electric machine
JP2011229312A (en) * 2010-04-21 2011-11-10 Mitsui High Tec Inc Layered core
JP2013116010A (en) * 2011-11-30 2013-06-10 Aisin Aw Co Ltd Rotor core of rotary electric machine

Also Published As

Publication number Publication date
WO2015198382A1 (en) 2015-12-30
JPWO2015198382A1 (en) 2017-04-20

Similar Documents

Publication Publication Date Title
EP2798724B1 (en) Motor
KR20140105854A (en) Rotor blade set of an electric motor
JP4907654B2 (en) Split type iron core and manufacturing method thereof, stator iron core
JP5038475B2 (en) Rotor
JP4483895B2 (en) Rotating electric machine and compressor
JP4706397B2 (en) Rotor for rotating electrical machine and method for manufacturing the same
US20120223607A1 (en) Electric rotating machine
US9369013B2 (en) Rotor for motor
JP5278551B2 (en) Rotor core for rotating electrical machine and manufacturing method thereof
US7893591B2 (en) Laminated rotor core and method for manufacturing the same
JP4444737B2 (en) Brushless motor and motor for power steering device
US9136735B2 (en) Rotary electric machine laminated core
US20140035421A1 (en) Rotor of rotary electric machine
EP2549623B1 (en) Rotor and method of manufacturing the rotor
CN101189780B (en) Armature of rotating electric machine and method of manufacturing the same
JP2007068310A (en) Laminated winding core for rotary machine
JP4286829B2 (en) Manufacturing method of rotating machine
WO2008047942A1 (en) Stator core and rotating electrical machine
JP5511956B2 (en) Rotating electrical machine laminated iron core
JP2005110464A (en) Stator core for motor and manufacturing method therefor
KR101135251B1 (en) Devided-core of eps motor stator
JP2005192288A (en) Rotor of reluctance motor
JP5657085B1 (en) Rotating electric machine and method for manufacturing stator for rotating electric machine
JP2010011681A (en) Rotor structure of permanent magnet rotating machine
US8456056B2 (en) Rotor core for rotating electric machine

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20160905

A529 Written submission of copy of amendment under section 34 (pct)

Free format text: JAPANESE INTERMEDIATE CODE: A5211

Effective date: 20160905

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20170613

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20170711

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20180109

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20180226

A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 20180724

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20181012

A911 Transfer of reconsideration by examiner before appeal (zenchi)

Free format text: JAPANESE INTERMEDIATE CODE: A911

Effective date: 20181023

A912 Removal of reconsideration by examiner before appeal (zenchi)

Free format text: JAPANESE INTERMEDIATE CODE: A912

Effective date: 20181207

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20191204

R150 Certificate of patent or registration of utility model

Ref document number: 6656149

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20200204